On the Xbox you can move the camera round pretty much any time with the right stick, but the only distance choice is standard or (by holding the left trigger down) an almost over the shoulder view. For the PC version you can pan the camera around freely when paused, or IIRC use the mouse to zoom in or out during play (with the angle linked to the distance).
I don't think you can pan around when paused in the PC. This may just be me, but I am pretty sure you can't just by being pauses, so there must be another button to press or something, or you just can't do it.
